Simpsonville, United States experiences average highs of 22°C (72°F) and lows of 12°C (54°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have cooled by 1.2°C (2.2°F) across the available records.
Simpsonville, United States Weather & Climate 2026
Monthly climate averages for Simpsonville, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.6/10
Best: April, May, September, October
UV Index
6
High
Temperature 22°C / 12°C
Feels Like 22°C / 12°C
Rainy Days 10
Rainfall 103 mm
Sunshine 9 h
Humidity 71%
Wind Speed 14 km/h
Dew Point 12°C
Snow Days 1 days
Frost Days 6 days
Hottest Month
32°C
July
Avg Low22°C
Rain14days
Coldest Month
2°C
January
Avg High11°C
Rain10days
Driest Month
6days
October
Avg High23°C
Avg Low13°C
Windiest Month
16 km/h
March (Gusts 39)
Worst Time to Visit
Consider avoiding January, February, July, December due to frequent rain.
Sun Position
Sunrise 06:17
Daylight 14.5h
Sunset 20:45
Live conditions—
Simpsonville on the map · live conditions
Simpsonville, United States
- Continent
- Americas
- Country
- United States
- City
- Simpsonville
- Population
- 20.7K
- Elevation
- 262 m
- Coordinates
- 34.74°, -82.25°
Seasonal Breakdown
Spring
Mar–May
Avg High 22°C
Avg Low 11°C
Rain 11 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 31°C
Avg Low 21°C
Rain 13 days/mo
Autumn
Sep–Nov
Avg High 23°C
Avg Low 13°C
Rain 7 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 13°C
Avg Low 4°C
Rain 10 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 11°C / 2°C . Feb: 15°C / 5°C . Mar: 18°C / 7°C . Apr: 22°C / 11°C . May: 26°C / 16°C . Jun: 30°C / 20°C . Jul: 32°C / 22°C . Aug: 30°C / 21°C . Sep: 28°C / 19°C . Oct: 23°C / 13°C . Nov: 17°C / 7°C . Dec: 12°C / 4°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 113 mm. Feb: 107 mm. Mar: 98 mm. Apr: 115 mm. May: 120 mm. Jun: 89 mm. Jul: 99 mm. Aug: 126 mm. Sep: 102 mm. Oct: 82 mm. Nov: 75 mm. Dec: 108 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 71%. Feb: 73%. Mar: 67%. Apr: 66%. May: 71%. Jun: 71%. Jul: 73%. Aug: 76%. Sep: 71%. Oct: 70%. Nov: 69%. Dec: 74%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 16 km/h . Mar: 16 km/h . Apr: 16 km/h . May: 14 km/h . Jun: 13 km/h . Jul: 11 km/h . Aug: 11 km/h . Sep: 12 km/h . Oct: 13 km/h . Nov: 14 km/h . Dec: 14 km/h .
Sunshine
Sunshine
Sunshine: Jan: 7h. Feb: 7h. Mar: 8h. Apr: 10h. May: 10h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 8h. Nov: 7h. Dec: 6h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 4. Mar: UV 6. Apr: UV 7. May: UV 7. Jun: UV 8. Jul: UV 8. Aug: UV 7. Sep: UV 6. Oct: UV 5. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 1 days. Feb: 1 days. Mar: 0 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 1 days.
Climate Trends
Average highs have cooled by 1.2°C (2.2°F) across the available records. Average rainfall is trending wetter by about 23 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 32°C | Jul · 32°C |
| Coldest month | Jan 2025 · -1°C | Jan · 2°C |
| Wettest month | Aug 2025 · 226 mm | Aug · 126 mm |
| Windiest month | Mar 2025 · 18 km/h | Mar · 16 km/h |
Month-by-Month Weather Table
January
Poor 
February
Fair March
Good April best
Excellent May best
Excellent June
Good July
Fair August
Fair September best
Excellent October best
Excellent November
Good December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 11°C / 2°C | 8°C / -1°C | 10days (113 mm) Wet | 6.6h Fair | 71% Muggy | 3.4 Moderate | Poor | View Details |
| February | 15°C / 5°C | 13°C / 2°C | 10days (107 mm) Wet | 6.6h Fair | 73% Muggy | 4.2 Moderate | Fair | View Details |
| March | 18°C / 7°C | 17°C / 5°C | 11days (98 mm) Wet | 8.1h Good | 67% Muggy | 5.7 High | Good | View Details |
| April best | 22°C / 11°C | 22°C / 9°C | 9days (115 mm) Wet | 9.8h Good | 66% Muggy | 6.8 High | Excellent | View Details |
| May best | 26°C / 16°C | 27°C / 16°C | 12days (120 mm) Wet | 10.2h Excellent | 71% Muggy | 7.1 Very High | Excellent | View Details |
| June | 30°C / 20°C | 33°C / 22°C | 12days (89 mm) Wet | 11.3h Excellent | 71% Muggy | 8 Very High | Good | View Details |
| July | 32°C / 22°C | 36°C / 26°C | 14days (99 mm) Wet | 11.8h Excellent | 73% Muggy | 8.2 Very High | Fair | View Details |
| August | 30°C / 21°C | 34°C / 24°C | 14days (126 mm) Wet | 10.5h Excellent | 76% Humid | 7.2 Very High | Fair | View Details |
| September best | 28°C / 19°C | 30°C / 20°C | 8days (102 mm) Wet | 9.6h Good | 71% Muggy | 6.4 High | Excellent | View Details |
| October best | 23°C / 13°C | 23°C / 13°C | 6days (82 mm) Good | 8.4h Good | 70% Muggy | 5.2 High | Excellent | View Details |
| November | 17°C / 7°C | 15°C / 5°C | 7days (75 mm) Good | 7.4h Good | 69% Muggy | 3.7 Moderate | Good | View Details |
| December | 12°C / 4°C | 10°C / 1°C | 10days (108 mm) Wet | 5.9h Fair | 74% Muggy | 2.9 Moderate | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Simpsonville are April, May, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Simpsonville, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Simpsonville is July, with average daytime highs of 32°C (90°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Simpsonville is January, with average overnight lows of 2°C (36°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Simpsonville is August, averaging 126mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Simpsonville runs through July, August, May, June, with the heaviest rainfall in July. Based on 10-year averages for Simpsonville.
Simpsonville receives approximately 106 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Simpsonville.
The least favorable months to visit Simpsonville are January, February, July, December, primarily due to frequent rain. For the best conditions, consider April, May, September, October instead.
The annual average UV index in Simpsonville is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Simpsonville is 71%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Simpsonville receives snow. Months with snowfall average 1 snow days and 2 cm (1 in) of accumulation, with about 6 frost days during winter.
Average wind speeds in Simpsonville are 14 km/h (9 mph). The windiest month is March with peak winds reaching 16 km/h (10 mph) (gusts up to 39 km/h / 24 mph).
Simpsonville averages 6 clear-sky days per month with overall cloud cover around 55%. The clearest skies occur in October.
The annual average dew point in Simpsonville is 12°C (54°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Simpsonville has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Simpsonville ranges from 12°C (54°F) to 22°C (72°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Simpsonville. It earns a climate score of 7.4/10 with Good.
For June in Simpsonville, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 30°C (86°F) and 12 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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